Create fimrware/asm directory for assembly optimized stuff.

This dir is suitable for stuff that doesn't fit the target tree, e.g. because
it also builds on hosted or otherwise. It also has a generic subfolder for
fallback C implementations so that not all archs need to provide asm files.

SOURCES should only contain "foo.c" where foo.c includes the specific
<arch>/foo.c files from the subdirs using the preprocessor. This way automatic
selection of asm versions or generic C verion is possible.

For the start, the thread support files are moved, since ASM threads can
be used on hosted platforms as well. Since core_sleep() remains platform
specific it's moved to the corresponding system.h headers.

Change-Id: Iebff272f3407a6eaafeb7656ceb0ae9eca3f7cb9

1 files changed, 27 insertions, 0 deletions

diff --git a/firmware/target/arm/system-arm.h b/firmware/target/arm/system-arm.h
index ffce77a176..719ec82f1b 100644
--- a/firmware/target/arm/system-arm.h
+++ b/firmware/target/arm/system-arm.h
@@ -347,4 +347,31 @@ static inline uint32_t swaw32_hw(uint32_t value)
 
 }
 
+#if defined(CPU_TCC780X) || defined(CPU_TCC77X) /* Single core only for now */ \
+|| CONFIG_CPU == IMX31L || CONFIG_CPU == DM320 || CONFIG_CPU == AS3525 \
+|| CONFIG_CPU == S3C2440 || CONFIG_CPU == S5L8701 || CONFIG_CPU == AS3525v2 \
+|| CONFIG_CPU == S5L8702
+/* Use the generic ARMv4/v5/v6 wait for IRQ */
+static inline void core_sleep(void)
+{
+    asm volatile (
+        "mcr p15, 0, %0, c7, c0, 4 \n" /* Wait for interrupt */
+#if CONFIG_CPU == IMX31L
+        "nop\n nop\n nop\n nop\n nop\n" /* Clean out the pipes */
+#endif
+        : : "r"(0)
+    );
+    enable_irq();
+}
+#else
+/* Skip this if special code is required and implemented */
+#if !(defined(CPU_PP)) && CONFIG_CPU != RK27XX && CONFIG_CPU != IMX233
+static inline void core_sleep(void)
+{
+    /* TODO: core_sleep not implemented, battery life will be decreased */
+    enable_irq();
+}
+#endif /* CPU_PP */
+#endif
+
 #endif /* SYSTEM_ARM_H */